Methods of preparing and operating portable, point-of-care, user-initiated fluidic assay systems

ABSTRACT

Methods of preparing assays and of assaying, using substantially self-contained, portable, user-initiated fluidic assay systems. Example assays include diagnostic assays and chemical detection assays. Diagnostic assays may include, without limitation, enzyme-linked immuno-sorbent assays (ELISA), and may include one or more sexually transmitted disease (STD) diagnostic assays. An assay system may include one or more fluid chambers, one or more fluid paths amongst the fluid chambers and/or between the fluid chambers, a sample portion, and/or an assay portion. The assay system may include a fluid controller system to dispense fluid from the one or more fluid chambers, and a user-initiated actuator to control the fluid controller system. The fluid controller system may be configured to dispense fluids serially, and may be configured to mix a plurality of fluids. The user-initiated actuator system may include an external user-operated trigger mechanism. The assay apparatus may include a display window to view assay results.

BACKGROUND

Given the great strain on the healthcare work force, the increasedprevalence of many common diseases and the substantial delay intreatment caused by remote testing, it has become imperative to developrapid, easy-to-use automated diagnostic devices and platforms to enableefficient and accurate point-of-care disease detection.

Historic obstacles to point-of-care devices include manufacturingchallenges, ease-of-use limitations, and government regulations. Some ofthese obstacles have been reduced through advances in technology andrecognition by governments and other regulatory bodies of the importanceof point-of-care testing. However, important considerations, includingease-of-use and accuracy, still render point-of-care tests unsuitablefor many healthcare facilities.

Conventional point-of-care diagnostic systems utilize capillary actionor test strips, which provide limited ability to perform many diagnosticassays, such as fluidic assays.

Fluidic assays, such as enzyme-linked immuno-sorbent assays (ELISAs),are capable of detecting the presence of many diseases ranging fromcancer to diseases like herpes simplex type 2, and generally requirerelatively few operational steps. However, these steps are typicallypreformed by trained lab technicians.

SUMMARY

Disclosed herein are methods and systems to perform point-of-care,user-initiated fluidic assays, using substantially self-contained,portable, user-initiated fluidic assay systems.

Example assays include diagnostic assays and chemical detection assays.Diagnostic assays include, without limitation, enzyme-linkedimmuno-sorbent assays (ELISA), and may include one or more sexuallytransmitted disease (STD) diagnostic assays.

An assay system may include a housing having one or more fluid chambers,a fluid controller system to dispense fluid from the one or more fluidchambers, and a user-initiated actuator to control the fluid controllersystem.

The actuator may be configured to serially move fluid controllers fromfunctionally closed positions to functionally open positions, to controlfluid flow from the fluid chambers.

The fluid controller system may be configured to dispense fluidsserially, and may be configured to mix a plurality of fluids.

The housing may include an assay portion and the fluid controller systemmay be configured to dispense fluids from one or more of the fluidchambers to the assay portion.

The housing may include one or more fluid paths amongst the fluidchambers and/or to the assay portion, and the fluid controller systemmay be configured to serially align fluid chamber outlets withcorresponding fluid paths.

The housing may include a sample chamber to receive an assay sample,such as a biological sample, and one or more of the fluid paths mayinclude the sample chamber.

The user-initiated actuator system may include an external user-operatedtrigger mechanism to initiate the actuator system. The actuator systemmay include a mechanical actuator system, and may include a compressiblespring actuator system.

The assay apparatus may include a display window to view assay results.

BRIEF DESCRIPTION OF THE DRAWINGS/FIGURES

In the drawings, like reference numbers indicate identical orfunctionally similar elements. Additionally, the leftmost digit(s) of areference number identifies the drawing in which the reference numberfirst appears.

FIG. 1 is a process flowchart of a method of performing an assay with asubstantially self-contained, point-of-care, user-initiated fluidicassay system.

FIG. 2 is a block diagram of a portable, point-of-care, user-initiatedfluidic assay system.

FIG. 3 is a perspective view of a portable, point-of-care,user-initiated fluidic assay system.

FIG. 4 is a process flowchart of a method of preparing a portable,point-of-care, user-initiated fluidic assay system.

FIG. 5 is a process flowchart of a method of using an assay systemprepared in accordance with FIG. 4.

FIG. 6 is a cross-sectional block diagram of a pump 600.

FIG. 7 is another cross-sectional block diagram of pump 600.

FIG. 8 is a cross-sectional block diagram of view A-A of pump 600.

FIG. 9 is a cross-sectional block diagram of a multi-chamber pump 900.

FIG. 10 is another cross-sectional block diagram of pump 900.

FIG. 11 is a cross-sectional block diagram of a pump 1100 configured toserially mix fluids from multiple fluid chambers.

FIG. 12 is another cross-sectional block diagram of pump 1100.

FIG. 13 is another cross-sectional block diagram of pump 1100.

FIG. 14 is another cross-sectional block diagram of pump 1100.

FIG. 15 is a cross-sectional block diagram of a pump 1500 configured tosimultaneously mix fluids from multiple fluid chambers.

FIG. 16 is another cross-sectional block diagram of pump 1500.

FIG. 17 is another cross-sectional block diagram of pump 1500.

FIG. 18 is a cross-sectional block diagram of a pump 1800 configured tosimultaneously mix fluids from multiple fluid chambers.

FIG. 19 is another cross-sectional block diagram of pump 1800.

FIG. 20 is another cross-sectional block diagram of pump 1800.

FIG. 21 is a cross-sectional block diagram of a portion of an assaysystem 2100, including a user-initiated actuator.

FIG. 22 is a cross-sectional perspective view of an assay system 2200.

FIG. 23 is a cross-sectional block diagram of assay system 2200.

FIG. 24 is another cross-sectional block diagram of assay system 2200.

FIG. 25 is another cross-sectional block diagram of assay system 2200.

FIG. 26 is another cross-sectional block diagram of assay system 2200.

FIG. 27 is another cross-sectional block diagram of assay system 2200.

FIG. 28 is a cross-sectional perspective view of an assay system 2800.

FIG. 29 is another cross-sectional block diagram of assay system 2800.

FIG. 30 is another cross-sectional block diagram of assay system 2800.

FIG. 31 is another cross-sectional block diagram of assay system 2800.

FIG. 32 is another cross-sectional block diagram of assay system 2800.

FIG. 33 is another cross-sectional block diagram of assay system 2800.

FIG. 34 is cross-sectional view of a mechanical actuator system 3400.

FIG. 35 is another cross-sectional view of mechanical actuator system3400.

FIG. 36 is another cross-sectional view of mechanical actuator system3400.

FIG. 37 is a perspective view of an assay system 3700.

FIG. 38 is another perspective view of assay system 3700.

FIG. 39 is a cross-sectional diagram of mechanical control rod actuators3910.

FIG. 40 is another cross-sectional diagram of control rod actuators3910.

FIG. 41 is another cross-sectional diagram of control rod actuators3910.

DETAILED DESCRIPTION

Disclosed herein are methods of performing point-of-care, user-initiatedfluidic assays, and substantially self-contained, portable,point-of-care, user-initiated fluidic assay systems.

Example methods and systems are described herein with respect toimmunoassays, for illustrative purposes. Based on the teachings herein,one skilled in the art will understand that the methods may beimplemented with respect to other diagnostic assays and with respect tochemical assays.

An immunoassay is a biochemical test to detect a substance, or measure aconcentration of a substance, in a biological sample such as blood,saliva, or urine, using a reaction between an antibody and an antigenspecific to the antibody.

An immunoassay may be used to detect the presence of an antigen or anantibody. For example, when detecting an infection, the presence of anantibody against the pathogen may be measured. When detecting hormonessuch as insulin, the insulin may be used as the antigen.

Accordingly, where a method or system is described herein to detect aprimary binding pair molecule using a corresponding second binding pairmolecule, it should be understood that the primary binding pair moleculemay be an antibody or an antigen, and the second binding pair moleculemay be a corresponding antigen or antibody, respectively. Similarly,where a method or system is described herein to detect an antibody orantigen, the method or system may be implemented to detect acorresponding antigen or antibody, respectively.

Immunoassays may also be used to detect potential food allergens andchemicals, or drugs.

Immunoassays include labeled immunoassays to provide a visual indicationof a binding pair of molecules. Labeling may include an enzyme,radioisotopes, magnetic labels, fluorescence, agglutination,nephelometry, turbidimetry and western blot.

Labeled immunoassays include competitive and non-competitiveimmunoassays. In a competitive immunoassay, an antigen in a samplecompetes with labeled antigen to bind with antibodies. The amount oflabeled antigen bound to the antibody site is inversely proportional tothe concentration of antigen in the sample. In noncompetitiveimmunoassays, also referred to as sandwich assays, antigen in a sampleis bound to an antibody site. The labeled antibody is then bound to theantigen. The amount of labeled antibody on the site is directlyproportional to the concentration of the antigen in the sample.

Labeled immunoassays include enzyme-linked immuno-sorbent assays(ELISA).

In an example immunoassay, a biological sample is tested for a presenceof a primary binding pair molecule. A corresponding binding pairmolecule that is specific to the primary binding pair molecule isimmobilized on an assay substrate. The biological sample is contacted tothe assay substrate. Any primary binding pair molecules in thebiological sample attach to, or are captured by the correspondingbinding pair molecules. The primary binding pair molecules are alsocontacted with labeled secondary binding pair molecules that attach tothe primary binding pair molecules. This may be performed subsequent to,prior to, or simultaneously with the contacting of the primary bindingpair molecule with the corresponding immobilized binding pair molecule.Un-reacted components of the biological sample and fluids may beremoved, or washed from the assay substrate. Presence of the label onthe assay substrate indicates the presence of the primary binding pairmolecule in the biological sample.

The label may include a directly detectable label, which may be visibleto a human observer, such as gold particles in a colloid or solution,commonly referred to as colloidal gold.

The label may include an indirect label, such an enzyme whereby theenzyme works on a substrate to produce a detectable reaction product.For example, an enzyme may attach to the primary binding pair molecule,and a substance that the enzyme converts to a detectable signal, such asa fluorescence signal, is contacted to the assay substrate. When lightis directed at the assay substrate, any binding pair molecule complexeswill fluoresce so that the presence of the primary binding pair moleculeis observable.

An immunoassay may utilize one or more fluid solutions, which mayinclude a dilutent solution to fluidize the biological sample, aconjugate solution having the labeled secondary binding pair molecules,and one or more wash solutions. The biological sample and fluids may bebrought into contact, concurrently or sequentially with the assaysubstrate. The assay substrate may include an assay surface or an assaymembrane, prepared with a coating of the corresponding binding pairmolecules.

As described above, the second binding pair molecules may include anantigen that is specific to an antibody to be detected in a biologicalsample, or may include antibody that is specific to an antigen to bedetected in the biological sample. By way of illustration, if theprimary binding pair molecule to be detected is an antigen, theimmobilized binding pair molecule and the secondary labeled binding pairmolecule will be antibodies, both of which react with the antigen. Whenthe antigen is present in the biological sample, the antigen will beimmobilized by the immobilized antibody and labeled by the labeledsecondary antibody, to form a sandwich-like construction, or complex.

It is known that non-specific or un-reacted components may bebeneficially removed using wash solutions, often between processesand/or prior to a label detection process, in order to improvesensitivity and signal-to-noise ratios of the assay. Other permutationsare possible as well. For example, a conjugate solution, such as alabeled secondary binding pair molecule solution may be mixed with oract as a sample dilutent to advantageously transport the biologicalsample to the assay substrate, to permit simultaneous binding of theprimary binding pair molecule and the labeled secondary binding pairmolecule to the immobilized binding pair molecule. Alternatively, oradditionally, the sample dilutent may include one or more detergentsand/or lysing agents to advantageously reduce deleterious effects ofother components of the biological sample such as cellular membranes,non-useful cells like erythrocytes and the like.

Those skilled in the art will readily recognize that such fluidcomponents and the order of the reactionary steps may be readilyadjusted along with concentrations of the respective components in orderto optimize detection or distinguishment of analytes, increasesensitivity, reduce non-specific reactions, and improve signal to noiseratios.

As will be readily understood, if the secondary antibody is labeled withan enzyme instead of a fluorescent or other immediately detectablelabel, an additional substrate may be utilized to allow the enzyme toproduce a reaction product which will be advantageously detectable. Anadvantage of using an enzyme based label is that the detectable signalmay increase over time as the enzyme works on an excess of substrate toproduce a detectable product.

FIG. 1 is a process flowchart of a method 100 of detecting a primarybinding pair molecule in a biological sample, using a substantiallyself-contained, point-of-care, user-initiated fluidic assay system. Theprimary binding pair molecule may correspond to an antibody or anantigen.

At 102, a biological sample is provided to the assay system. Thebiological sample may include one or more of a blood sample, a salivasample, and a urine sample. The biological sample may be applied to asample substrate within the assay system.

At 104, a fluidic actuator within the assay system is initiated by auser. The fluidic actuator may include a mechanical actuator, such as acompressed spring actuator, and may be initiated with a button, switch,or lever. The fluidic actuator may be configured to impart one or moreof a physical force, pressure, centripetal force, gas pressure,gravitational force, and combinations thereof, on a fluid controllersystem within the assay system.

At 106, the biological sample is fluidized with a dilutent fluid. Thedilutent fluid may flow over or through the sample substrate, undercontrol of the fluid controller system.

At 108, the fluidized biological sample is contacted to a correspondingbinding pair molecule that is specific to primary binding pair molecule.The corresponding binding pair molecule may be immobilized on an assaysubstrate within the assay system. The fluidized biological sample mayflow over or through the assay substrate, under control of the fluidcontroller system.

Where the fluidized biological sample includes the primary binding pairmolecule, the primary binding pair molecule attaches to thecorresponding binding pair molecule and becomes immobilized on the assaysubstrate. For example, where the second binding pair molecule includesa portion of a pathogen, and where the biological sample includes anantibody to the pathogen, the antibody attaches to the antigenimmobilized at the assay substrate.

At 110, a labeled conjugate solution is contacted to the assaysubstrate, under control of the fluid controller system. The labeledconjugate solution includes a secondary binding pair molecule to bindwith the primary binding pair molecule. Where the primary binding pairmolecule is immobilized on the assay substrate with the correspondingbinding pair molecule, the secondary binding pair molecule attaches tothe immobilized primary binding pair molecule, effectively creating asandwich-like construct of the primary binding pair molecule, thecorresponding binding pair molecule, and the labeled secondary bindingpair molecule.

The secondary binding pair molecule may be selected as one that targetsone or more proteins commonly found in the biological sample. Forexample, where the biological sample includes a human blood sample, thesecondary binding pair molecule may include an antibody generated by anon-human animal in response to the one or more proteins commonly foundin human blood.

The secondary binding pair molecule may be labeled with human-visibleparticles, such as a gold colloid, or suspension of gold particles in afluid such as water. Alternatively, or additionally, the secondarybinding pair molecule may be labeled with a fluorescent probe.

Where the labeled secondary binding pair molecule attaches to a primarybinding pair molecule that is attached to a corresponding binding pairmolecule, at 110, the label is viewable by the user at 112.

Method 100 may be implemented to perform multiple diagnostic assays inan assay system. For example, a plurality of antigens, each specific toa different antibody, may be immobilized on one or more assay substrateswithin an assay system. Similarly, a plurality of antibodies, eachspecific to a different antigen, may be immobilized on one or more assaysubstrates within an assay system

FIG. 2 is a block diagram of a portable, point-of-care, user-initiatedfluidic assay system 200, including a housing 202, a user-initiatedactuator 204, a fluidic pump 206, and an assay result viewer 218.

Pump 206 includes one or more fluid chambers 210, to contain fluids tobe used in an assay. One or more of fluid chambers 210 may have, withoutlimitation, a volume in a range of 0.5 to 2 milliliters.

Pump 206 includes a sample substrate 214 to hold a sample. Samplesubstrate 214 may include a surface or a membrane positioned within acavity or a chamber of housing 202, to receive one or more samples, asdescribed above.

Sample substrate 214 may include a porous and/or absorptive material,which may be configured to absorb a volume of liquid in a range of 10 to500 μL, including within a range of up to 200 μL, and including a rangeof approximately 25 to 50 μL.

Pump 206 includes an assay substrate 216 to hold an assay material.Assay substrate 216 may include a surface or a membrane positionedwithin a cavity or chamber of housing 202, to receive one or more assaycompounds or biological components, such as an antigen or an antibody,as described above.

Fluid chambers 210 may include a waste fluid chamber.

Pump 206 further includes a fluid controller system 208, which mayinclude a plurality of fluid controllers, to control fluid flow from oneor more fluid chambers 212 to one or more of sample substrate 214 andassay substrate 216, responsive to actuator 204.

Actuator 204 may include a mechanical actuator, which may include acompressed or compressible spring actuator, and may include a button,switch, lever, twist-activator, or other user-initiated feature.

Assay result viewer 218 may include a display window disposed over anopening through housing 202, over assay substrate 216.

FIG. 3 is a perspective view of a portable, point-of-care,user-initiated fluidic assay system 300, including a housing 302, auser-initiated actuator button 304, a sample substrate 306, and a samplesubstrate cover 308. Sample substrate cover 308 may be hingedly coupledto housing 302.

Assay system 300 further includes an assay result viewer 310, which maybe disposed over an assay substrate. Assay result view 310 may bedisposed at an end of assay system 300, as illustrated in FIG. 3, oralong a side of assay system 300.

Assay system 300 may have, without limitation, a length in a range of 5to 8 centimeters and a width of approximately 1 centimeter. Assay system300 may have a substantially cylindrical shape, as illustrated in FIG.3, or other shape.

Assay system 300, or portions thereof, may be implemented with one ormore substantially rigid materials, and/or with one or more flexible orpliable materials, including, without limitation, polypropylene.

Example portable, point-of-care, user-initiated fluidic assay systemsare disclosed further below.

FIG. 4 is a process flowchart of a method 400 of preparing a portable,point-of-care, user-initiated fluidic assay system. Method 400 isdescribed below with reference to assay system 200 in FIG. 2, forillustrative purposes. Method 400 is not, however, limited to theexample of FIG. 2.

At 402, a binding pair molecule is immobilized on an assay substrate,such as assay substrate 216 in FIG. 2. The binding pair molecule mayinclude an antigen specific to an antibody, or an antibody specific toan antigen.

At 404, a first one of fluid chambers 210 is provided with a dilutentsolution to fluidize a sample.

At 406, a second one of fluid chambers 210 is provided with a labeledsecondary binding pair molecule solution.

At 408, a third one of fluid chambers 210 is provided with a washsolution, which may include one or more of a saline solution and adetergent. The wash solution may be substantially similar to thedilutent solution.

FIG. 5 is a process flowchart of a method 500 of using an assay systemprepared in accordance with method 400. Method 500 is described belowwith reference to assay system 200 in FIG. 2, and assay system 300 inFIG. 3, for illustrative purposes. Method 500 is not, however, limitedto the examples of FIG. 2 and FIG. 3.

At 502, a sample is provided to a sample substrate, such as samplesubstrate 214 in FIG. 2, and sample substrate 306 in FIG. 3.

At 504, a user-initiated actuator is initiated by the user, such asuser-initiated activator 204 in FIG. 2, and button 304 in FIG. 3. Theuser initiated actuator acts upon a fluid controller system, such asfluid controller system 208 in FIG. 2.

At 506, the dilutent solution flows from first fluid chamber andcontacts the sample substrate and the assay substrate, under control ofthe fluid controller system.

As the dilutent fluid flows over or through the sample substrate, thesample is dislodged from the sample substrate and flows with thedilutent solution to the assay substrate.

At 508, the labeled secondary binding pair solution flows from thesecond fluid chamber and contacts the assay substrate, under control ofthe fluid controller system. The labeled secondary binding pair solutionmay flow directly to the assay substrate or may flow over or through thesample substrate.

At 510, the wash solution flows from the third fluid chamber and washesthe assay substrate, under control of fluid controller system 208. Thewash solution may flow from the assay substrate to a waste fluidchamber,

At 512, assay results are viewable, such as at assay result viewer 218in FIG. 2, and assay result viewer 310 in FIG. 3.

An assay substrate may include a nitrocellulose-based membrane,available from Invitrogen Corporatation, of Carlsbad, Calif.

Preparation of a nitrocellulose-based membrane may include incubationfor approximately thirty (30) minutes in a solution of 0.2 mg/mL proteinA, available from Sigma-Aldrich Corporation, of St. Louis, Mo., in aphosphate buffered saline solution (PBS), and then dried atapproximately 37° for approximately fifteen (15) minutes. 1 μL of PBSmay be added to the dry membrane and allowed to dry at room temperature.Alternatively, 1 μL of an N-Hydroxysuccinimide (NHS) solution, availablefrom Sigma-Aldrich Corporation, of St. Louis, Mo., may be added to thedry membrane and allowed to dry at room temperature.

An assay method and/or system may utilize or include approximately 100μL of PBS/0.05% Tween wash buffer, available from Sigma-AldrichCorporation, of St. Louis, Mo., and may utilize or include approximately100 μL of protein G colloidal gold, available from Pierce Corporation,of Rockland, Ill.

An assay method and/or system may be configured to test for Chlamydia,and may utilize or include a sample membrane treated with wheat germagglutinin, to which an approximately 50 μL blood sample is applied.Approximately 150 μL of a lysing solution may then be passed through thesample membrane and then contacted to an assay substrate. Thereafter,approximately 100 μL of a colloidal gold solution may be contacted tothe assay substrate. Thereafter, approximately 500 μL of a washsolution, which may include the lysing solution, may be contacted to theassay membrane without passing through the sample membrane.

Additional features and embodiments are disclosed below. Based on thedescription herein, one skilled in the relevant art(s) will understandthat features and embodiments described herein may be practiced invarious combinations with one another.

I. Example Multiple Fluid Chamber, Serial Fluid Pump

FIGS. 6 and 7 are cross-sectional block diagrams of a pump 600,including a housing 602 having an inner wall surface 604, defining acavity 606 therein.

A fluid flow controller or plunger 612 is disposed within housing 602.Plunger 612 separates or defines first and second fluid chambers 618 aand 618 b. Plunger 612 is movable between a first position, asillustrated in FIG. 6, and a second position, as illustrated in FIG. 7.An outlet 608 in a base 624 of the housing 602 is in communication withsecond fluid chamber 618 a. Plunger 612 is controllable to dispensefluid from fluid chamber 618 a through outlet 608. Outlet 608 may leadto one or more other fluid chambers, which may include one or more of asample substrate and an assay substrate.

A stop 614 prevents plunger 612 from obstructing or sealing outlet 608when plunger 612 is in the second position (FIG. 7). Stop 614 can beimplemented in a variety of ways. FIG. 8 is a cross-sectional view ofhousing 602, above base 624 according to view AA (FIG. 7), wherein stop614 includes one or more protrusions extending from base 624 into cavity606. Alternatively, stop 614 can include one or more protrusionsextending from housing inner wall surface 604 into cavity 606, and/orextending from a surface 628 of plunger 612.

As illustrated in FIG. 7, when plunger 612 is in the second position,second fluid chamber 618 b is in fluid communication with first fluidchamber 618 a through a passageway or gate 610. The second position isreferred to herein as a functionally open position.

Gate 610 may be formed, etched, engraved, carved, or otherwiseimplemented or imparted as one or more channels on surface 604 and/or asone or more passages within housing inner wall 604, wherein openingsthrough housing inner wall surface 604 expose the one or more passagesto the cavity 606.

Gate 610 and plunger 612 are configured and/or dimensioned so thatplunger 612 obstructs, blocks, and/or seals gate 610, or a portionthereof, from second fluid chamber 618 b when plunger 612 is in thefirst position, thereby isolating first fluid chamber 618 a from secondfluid chamber 118 b, as illustrated in FIG. 6. The first position isreferred to herein as a functionally closed position.

In the example of FIGS. 6 and 7, gate 610 has a length 622 that isdimensionally greater than a plunger edge height 620. In thefunctionally closed position, plunger 612 blocks at least a portion ofgate 610, as illustrated in FIG. 6, or is positioned more distant frombase 624, so that first fluid chamber 618 a is isolated from secondfluid chamber 118 b.

Plunger 612 can be solid or hollow. Plunger surfaces 626 and 628 can besubstantially flat, concave, convex, and/or combinations thereof.

Plunger 612 is controllable by, for example and without limitation,centripetal force, gas pressure, physical pressure, including manualactivation, gravitational force, or combinations thereof.

In operation, as plunger 612 moves from the non-depressed orfunctionally closed position of FIG. 6, to the depressed or functionallyopen position of FIG. 7, fluid within first fluid chamber 618 a isexpelled through outlet 608. When plunger 612 reaches the depressed orfunctionally open position of FIG. 7, first fluid chamber 618 a is influid communication with second fluid chamber 618 b through gate 610,allowing fluid in second fluid chamber 618 b to be expelled through gate610 and through outlet 608, as illustrated by flow indicating arrows702. Fluid in second fluid chamber 618 b can be expelled by, for exampleand without limitation, centripetal force, gas pressure, physicalpressure, including manual activation, gravitational force, orcombinations thereof, optionally including a second plunger.

Based on the description herein, one skilled in the relevant art(s) willunderstand that gate 610 can be implemented with other configurations aswell, including configurations where gate 610, or a portion thereof, isimplemented within plunger 612. Such other configurations are within thespirit and scope of the present disclosure.

One or more additional plungers and corresponding gates are optionallyimplemented. Additional fluid chambers can be controlled to seriallydispense fluids therein, sequentially or out-of-order, and/or tointernally mix fluids from multiple fluid chambers. Example embodimentsare described below for illustrative purposes.

Pump 600 may be operated in reverse as a vacuum device.

II. Serial Dispensing

FIGS. 9 and 10 are cross-sectional block diagrams of an example multiplefluid chamber, serially dispensing pump 900. Pump 900 includes plungers912 a, 912 b, and 912 c, defining fluid chambers 918 a through 918 d.Pump 900 further includes stops 914 a through 914 c, which can beconfigured similar to, or different than stop 614 in FIGS. 6, 7 and 8.

In the example of FIGS. 9 and 10, plungers 912 a through 912 c arelongitudinally aligned with one another within a housing cavity 906, andare movable between functionally closed positions, as illustrated inFIG. 9, and functionally open positions, as illustrated in FIG. 10. Thefunctionally open and closed positions of plungers 912 a, 912 b, and 912c are generally defined with respect to whether they allow or retardfluid communication with respect to one or more fluid chambers.

Pump 900 includes gates 910 a through 910 c. In FIG. 9, when plunger 912a is in its functionally open position, fluid chambers 918 a and 918 bare in fluid communication with one another through gate 910 a. In FIG.10, when plunger 912 b is in its functionally open position, fluidchambers 918 b and 918 c are in fluid communication with one anotherthrough gate 910 b. When plunger 912 c is in its functionally openposition, fluid chambers 918 c and 918 d are in fluid communication withone another through gate 910 c.

Plungers 912 a through 912 c and gates 910 a through 910 c areconfigured, dimensioned, positioned, and/or controlled to allow fluidswithin the fluid chambers 918 a through 918 d to be expelled ordispensed serially. Example methods and systems for controlling plungers912 are described below.

In the example of FIGS. 9 and 10, gates 910 a through 910 c haverespective gate lengths 922, 906, and 908 (FIG. 10). Gate length 922 isgreater than gate length 906, which is greater than gate length 908.Gates 910 a through 910 c are laterally dispersed from one another so asnot to interfere with one another. A portion of gate 910 alongitudinally overlaps a portion of gate 910 b. A portion of gate 910 blongitudinally overlaps a portion of gate 910 c. Plungers 912 a through912 c have respective edge heights 920, 912, and 914. Edge height 920 isgreater than edge height 912, which is greater than edge height 914.Gate length 122 is greater than edge height 920. Gate length 906 isgreater than edge height 912. Gate length 908 is greater than edgeheight 914. Other dimensions may be implemented.

In operation, as plunger 112 a moves from its functionally closedposition to its functionally open position, fluid in fluid chamber 918 ais expelled through outlet 924. Outlet 924 may lead to one or more otherfluid chambers, which may include one or more of a sample substrate andan assay substrate. Plungers 912 b and 912 c typically move togetherwith plunger 912 a, thereby maintaining a substantially constant volumein each of fluid chambers 918 b through 918 c.

When plunger 912 a reaches its functionally open position, fluid chamber918 b is in fluid communication with fluid chamber 918 a and outlet 908through gate 910 a. Plunger 912 b is then moved from its functionallyclosed position to its functionally open position, thereby expelling ordispensing fluid in fluid chamber 918 b through gate 910 a and outlet908, as illustrated at 1002 in FIG. 10.

When plunger 912 b reaches its functionally open position, fluid chamber918 c is in fluid communication with fluid chamber 918 b through gate910 b, and is thus in fluid communication with fluid chamber 918 a andoutlet 908 through gate 910 a. Plunger 912 c is then moved from itsfunctionally closed position to its functionally open position, therebyexpelling or dispensing fluid in fluid chamber 918 c through gate 910 b,gate 910 a, and outlet 908, as illustrated at 1004 and 1002 in FIG. 10.

When plunger 912 c reaches its functionally open position, fluid chamber918 d is in fluid communication with fluid chamber 918 c through gate910 c, and is thus in fluid communication with fluid chamber 918 bthrough gate 910 b, and fluid chamber 918 a and outlet 908 through gate910 a. Fluid in fluid chamber 918 d is then expelled or dispensedthrough gates 910 c, 910 b, and 910 a, and outlet 908, as illustrated at1006, 1004, and 1002 in FIG. 10.

Movement of plungers 912 can be controlled in one or more of a varietyof ways. For example, pump 900 can include a stem 920 (FIG. 9) coupledto plunger 912 c to control plunger 912 c through applied force, such asa compressed spring or other mechanical actuator, and/or an inlet 922 toapply a gas and/or fluid pressure and/or vacuum to fluid chamber 918 d.

As stem 920 is moved into cavity 906, and/or as gas or fluid pressure isapplied through inlet 922, plunger 912 is forced in the direction ofoutlet 908. Since the plungers 912 are in functionally closed positions,resultant pressure in fluid chamber 918 c forces plunger 912 b in thedirection of outlet 908, which increases pressure in fluid chamber 918b, which forces plunger 912 a in the direction of outlet 908, dispensingfluid from fluid chamber 918 a through outlet 908. Continuedforce/pressure applied by stem 920 and/or inlet 922 cause plungers 912 band 912 c to continue to move as described above, serially dispensingfluid from fluid chamber 918 b, then from fluid chamber and 918 c.

Based on the description herein, one skilled in the relevant art(s) willunderstand that a multiple fluid, serial output, dispenser or pump canbe implemented with other housing shapes and forms, and other plungeralignment, movement, and control schemes.

III. Serial Mixing

FIGS. 11 through 14 are cross-sectional block diagrams of an examplemultiple fluid chamber, serial mixing pump 1100.

Pump 1100 includes plungers 1112 a through 1112 d, fluid chambers 1118 athrough 1118 c, and gates 1110 a through 1110 c. In the example below,plungers 1112 a through 1112 d are controlled to move fluid from fluidchamber 1118 c to fluid chamber 1118 a, then to move fluid from fluidchamber 1118 b to fluid chamber 1118 a, where the fluids mix. The mixedfluid in fluid chamber 1118 a is then pumped to another fluid chamberthrough gate 1110 a, or/or expelled through an outlet, The outlet maylead to one or more other fluid chambers, which may include one or moreof a sample substrate and an assay substrate.

FIG. 11 illustrates pump 1100 at an initial state.

FIG. 12 illustrates pump 1100 as plunger 1112 d moves in the directionof arrow 1120, moving fluid from fluid chamber 1118 c to fluid chamber1118 a through gate 1110 c. Plunger 1112 a simultaneously moves in thedirection of arrow 1122 to accommodate fluid from fluid chamber 1118 c.

When plunger 1112 d reaches plunger 1112 c, plungers 1112 c and 1112 bmove in tandem with plunger 11122, whereby gate 1110 c is sealed byplunger 1112 d and gate 1110 b is opened by plunger 1112 b. Plungers1112 c and 1112 d continue moving, thereby expelling fluid in fluidchamber 1118 b to fluid chamber 1118 a, where it mixes with the fluidfrom fluid chamber 1118 c, as illustrated in FIG. 13. Plunger 1112 acontinues to move as well, thereby accommodating the fluid from fluidchamber 1118 b.

In FIG. 14, plunger 1112 a moves slightly more, thereby opening gate1110 a. Plunger 1112 b, and optionally plungers 1112 c and 1112 d moveto expel the fluid in fluid chamber 1118 a through gate 1110 a. Gate1110 a may lead to one or more other fluid chambers, which may includeone or more of a sample substrate and an assay substrate.

Movement of plungers 1112 can be controlled in one or more of a varietyof ways. For example, pump 1100 can include a stem 1120 coupled toplunger 1112 d, and/or an inlet 1122, to control plungers 1112substantially as described above with respect to pump 900. Control ofplungers 1112 is not, however, limited to the examples of stem 1120 orinlet 1122.

IV. Simultaneous Mixing

FIGS. 15 through 17 are cross-sectional block diagrams of a multiplefluid chamber, simultaneous mixing pump 1500.

Pump 1500 includes plungers 1512 a through 1512 d, fluid chambers 1518 athrough 1518 c, and gates 1510 a through 1510 c. In the example below,plungers 1512 a through 1512 d are controlled to simultaneously movefluid from fluid chambers 1518 b and 1518 c to fluid chamber 1518 a,where they mix with one another. The mixed fluid in fluid chamber 1518 ais then pumped to another fluid chamber through gate 1510 a, or/orexpelled through an outlet. The outlet may lead to one or more otherfluid chambers, which may include one or more of a sample substrate andan assay substrate.

In FIGS. 15 and 16, plunger 1512 d moves in the direction of arrow 1520,moving fluid from fluid chamber 1518 c to fluid chamber 1518 a throughgate 1510 c. Simultaneously, plunger 1512 c moves in the direction ofarrow 1722, moving fluid from fluid chamber 1518 b to fluid chamber 1518a through gate 1510 b. Plunger 1512 a simultaneously moves in thedirection of arrow 1524 so that fluid chamber 1518 a accommodates thefluids from fluid chambers 1518 b and 1818 c.

In FIGS. 15 and 16, plunger 1512 a seals gate 1510 a. In FIG. 17, afterthe fluids from fluid chambers 1518 b and 1518 c have moved into fluidchamber 1518 a, plunger 1512 a moves in the direction of arrow 1524,thereby opening gate 1510 a, and plunger 1512 b moves in the directionof arrow 1720, thereby closing gates 1510 b and 1510 c. Plunger 1512 b,and optionally plungers 1512 c and 1512 d, continues to move in thedirection of arrow 1720, thereby expelling the mixed fluid in fluidchamber 1518 a, through gate 1510 a.

Movement of plungers 1512 can be controlled in one or more of a varietyof ways, such as described above with respect to pump 400, and/or asdescribed below with respect to FIGS. 16-19. Control of plungers 1512 isnot, however, limited to these examples.

V. Simultaneous Mixing, Opposing Directions

FIGS. 18 through 20 are cross-sectional block diagrams of a multiplefluid chamber, simultaneous mixing pump 1800, in which fluids flow fromopposing directions into a mixing chamber.

Pump 1800 includes plungers 1812 a through 1812 d, fluid chambers 1818 athrough 1818 c, and gates 1810 a through 1810 c. In the example below,plungers 1812 b and 1812 c are controlled to simultaneously move fluidfrom fluid chambers 1818 a and 1818 c to fluid chamber 1818 b, wherethey mix with one another. The mixed fluid in fluid chamber 1818 b isthen pumped to another fluid chamber through gate 1810 a, or/or expelledthrough an outlet.

In FIGS. 18 and 19, plunger 1812 b moves in the direction of arrow 1820,moving fluid from fluid chamber 1818 a to fluid chamber 1818 b throughgate 1810 b. Simultaneously, plunger 1812 c moves in the direction ofarrow 1822, moving fluid from fluid chamber 1818 c to fluid chamber 1818b through gate 1810 c.

In FIGS. 18 and 19, plunger 1812 b seals gate 1810 a. In FIG. 20, afterthe fluids from fluid chambers 1818 a and 1818 c have moved into fluidchamber 1818 b, plungers 1812 a and 1812 b move slightly in thedirection of arrow 2020, thereby opening gate 1810 a. Plunger 1812 c,and optionally plunger 1812 d move in the direction of arrow 2022,thereby expelling the mixed fluid in fluid chamber 1818 b through gate1810 a.

Movement of plungers 1812 can be controlled in one or more of a varietyof ways, such as described above with respect to pump 400. Control ofplungers 1812 is not, however, limited to these examples.

VI. Nested Plungers

FIG. 22 is a cross-sectional perspective view of a portion of an assaysystem 2200 including a housing portion 2202 and a fluid controllersystem, including a plurality of fluid controllers, or plungers 2204,2206, and 2208. Fluid controllers 2204, 2206, and 2208 define aplurality of fluid chambers, illustrated here as first, second, andthird fluid chambers 2210, 2212, and 2214, respectively. Fluidcontrollers 2204, 2206, and 2208 are slideably nested within oneanother.

Housing portion 2202 includes a sample chamber 2216 to receive a sample,and may include a sample substrate, membrane or pad 2218. Housingportion 2202 may include a cover mechanism such as a cover portion 2220,which may be removable or hingedly coupled to housing portion 2202, asdescribed above with respect to FIG. 3. Housing portion 2202 includes asample chamber inlet 2222 and a sample chamber outlet 2224.

Housing portion 2202 includes an assay chamber 2226 and an assay chamberinlet 2228, and may include an assay substrate, membrane or pad 2228 tocapture, react, and/or display assay results.

Housing portion 2202 includes an assay result viewer, illustrated hereas a display window 2232 disposed over assay chamber 2228.

Housing portion 2202 includes a waste fluid chamber 2234 to receivefluids from assay chamber 2226.

Housing portion 2202 includes a transient fluid chamber 2236 having oneor more fluid channels 2238, also referred to herein as a fluidcontroller bypass channel.

Housing portion 2202 further includes one or more other fluid channels2258.

First fluid chamber 2210 includes a fluid chamber outlet 2260,illustrated here as a space between fluid controller 2206 and an innersurface of hosing portion 2202.

Second fluid chamber 2212 includes a fluid chamber outlet 2248,illustrated here as a gate or passage through fluid controller 2204.

Third fluid chamber 2214 includes a fluid chamber outlet 2254,illustrated here as a gate through fluid controller 2206.

Fluid controllers 2204, 2206, and 2208 include one or more sealingmechanisms, illustrated here as O-rings 2240 and 2242, O-rings 2244 and2246, O-rings 2250 and 2252, and O-ring 2256.

Example operation of assay system 2200 is described below with respectto FIGS. 23-27.

FIG. 23 is a cross-sectional block diagram of assay system 2200, whereinfluid controllers 2204, 2206, and 2208 are illustrated in correspondinginitial or functionally closed first positions. When fluid controllers2204, 2206, and 2208 are in the initial positions, O-ring 2240 issealingly engaged against an inner surface of housing portion 2202,between first fluid chamber outlet 2260 and sample chamber inlet 2222,to substantially preclude fluid flow from fluid chamber 2210. Similarly,O-rings 2244 and 2246 are sealingly engaged against an inner surface ofhousing portion 2202 to substantially preclude fluid flow from fluidchamber 2212 through second fluid chamber outlet 2248. O-rings 2250 and2252 are sealingly engaged against an inner surface of housing portion2202 to substantially preclude fluid flow from fluid chamber 2214through third fluid chamber outlet 2254.

O-Rings 2244, 2246, 2250, 2252, and 2256 cause fluid controllers 2204,2206, and 2208 to be pressurizably engaged with one another, such that aforce applied to fluid controller 2208, in the direction of fluidcontrollers 2206 and 2204, causes the fluid controller system toserially move into functionally open positions with respect to first,second, and third fluid chambers 2210, 2212, and 2214, as describedbelow with respect to FIGS. 24-27.

FIG. 24 is a cross-sectional block diagram of assay system 2200, whereinthe fluid controller system has moved in a direction of arrow 2402,relative to housing portion 2202, to align first fluid chamber outlet2260 with a fluid path 2404 to assay chamber 2226. This is referred toherein as a first functionally open position. Fluid path 2404 includessample chamber inlet 2222, sample chamber 2216, sample chamber outlet2224, transient fluid chamber 2236, and assay chamber inlet 2228.

As continued force is applied to fluid controller 2208, fluidcontrollers 2204, 2206, and 2208 continue to move in the direction ofarrow 2402, to expel fluid from first fluid chamber 2210 to assaychamber 2226, through fluid path 2204. The fluid may flow over orthrough assay substrate 2230, to waste fluid chamber 2234.

FIG. 25 is a cross-sectional block diagram of assay system 2200, whereinthe fluid controller system has moved further in the direction of arrow2402, to align second fluid chamber outlet 2248 with a fluid path 2504to assay chamber 2226. This is referred to herein as a secondfunctionally open position. Fluid path 2504 includes fluid channel 2258to bypass O-ring 2246 and first fluid controller 2204, first fluidchamber outlet 2260, transient fluid chamber 2236, fluid channel 2238 tobypass O-rings 2240 and 2242, and assay chamber inlet 2228.

As continued force is applied to fluid controller 2208, fluidcontrollers 2206 and 2208 continue to move in the direction of arrow2402, to expel fluid from second fluid chamber 2212 to assay chamber2226, through fluid path 2504. The fluid may flow over or through assaysubstrate 2230, to waste fluid chamber 2234.

FIG. 26 is a cross-sectional block diagram of assay system 2200, whereinthe fluid controller system has moved further in the direction of arrow2402, to align third fluid chamber outlet 2254 with a fluid path 2604 toassay chamber 2226. This is referred to herein as a third functionallyopen position. Fluid path 2604 includes second fluid chamber outlet2248, fluid channel 2258, first fluid chamber outlet 2260, transientfluid chamber 2236, and assay chamber inlet 2228.

As continued force is applied to fluid controller 2208, fluid controller2208 continues to move in the direction of arrow 2402, to expel fluidfrom third fluid chamber 2214 to assay chamber 2226, through fluid path2604. The fluid may flow over or through assay substrate 2230, to wastefluid chamber 2234.

FIG. 27 is a cross-sectional block diagram of assay system 2200, whereinthe fluid controller system has expelled fluid from third fluid chamber2214.

Assay system 2200 may include an actuator system, which may beconfigured to act upon third fluid controller 2208.

FIG. 28 is a cross-sectional perspective view of a portion of an assaysystem 2800 including a housing portion 2802 and a fluid controllersystem, including a plurality of fluid controllers, or plungers 2804,2806, and 2808. Fluid controllers 2804, 2806, and 2808 define aplurality of fluid chambers, illustrated here as first, second, andthird fluid chambers 2810, 2812, and 2814, respectively. Fluidcontroller 2808 is slideably nested within fluid controller 2806.

Housing portion 2802 includes a sample chamber 2816 to receive a sample,and may include a sample substrate 2818, which may include a surface ofsample chamber 2816 or membrane therein. Housing portion 2802 mayinclude a cover mechanism such as a cover portion 2820, which may beremovable or hingedly coupled to housing portion 2802, as describedabove with respect to FIG. 3. Housing portion 2802 includes a samplechamber inlet 2822 and a sample chamber outlet 2824.

Housing portion 2802 includes an assay chamber 2826 and an assay chamberinlet 2828, and may include an assay substrate 2828 to capture, react,and/or display assay results. Assay substrate may include a surface ofassay chamber 2826 or a membrane therein.

Housing portion 2802 includes an assay result viewer, illustrated hereas a display window 2832 disposed over assay chamber 2828.

Housing portion 2802 includes a waste fluid chamber 2834 to receivefluids from assay chamber 2826.

Housing portion 2802 includes a transient fluid chamber 2836 having oneor more fluid channels 2838, also referred to herein as a fluidcontroller bypass channel.

Housing portion 2802 further includes fluid channels 2858 and 2862.

First fluid chamber 2810 includes a fluid chamber outlet 2860,illustrated here as a space between fluid controller 2806 and an innersurface of hosing portion 2802.

Second fluid chamber 2812 includes a fluid chamber outlet 2848,illustrated here as a space between fluid controller 2804 and an innersurface of hosing portion 2802.

Third fluid chamber 2814 includes a fluid chamber outlet 2854,illustrated here as a gate or passage through fluid controller 2806.

Fluid controllers 2804, 2806, and 2808 include one or more sealingmechanisms, illustrated here as O-rings 2840 and 2842, O-rings 2844 and2846, and O-ring 2856.

Example operation of assay system 2800 is described below with respectto FIGS. 29-33.

FIG. 29 is a cross-sectional block diagram of assay system 2800, whereinthe fluid controller system, including fluid controllers 2804, 2806, and2808, is illustrated in corresponding initial or functionally closedpositions. When fluid controllers 2804, 2806, and 2808 are in theinitial positions, O-ring 2842 is sealingly engaged against an innersurface of housing portion 2802, between first fluid chamber outlet 2860and sample chamber inlet 2822, to substantially preclude fluid flow fromfluid chamber 2810. Similarly, O-ring 2840 is sealingly engaged againstan inner surface of housing portion 2802 to substantially preclude fluidflow from fluid chamber 2812 through second fluid chamber outlet 2848.O-rings 2844 and 2846 are sealingly engaged against an inner surface ofhousing portion 2802 to substantially preclude fluid flow from fluidchamber 2814 through third fluid chamber outlet 2854.

O-Rings 2840, 2842, 2844, 2846, and 2856 cause fluid controllers 2804,2806, and 2808 to be pressurizably engaged with one another, such that aforce applied to fluid controller 2808, in the direction of fluidcontrollers 2806 and 2804, causes the fluid controller system toserially move into functionally open positions with respect to first,second, and third fluid chambers 2810, 2812, and 2814, as describedbelow with respect to FIGS. 30-33.

FIG. 30 is a cross-sectional block diagram of assay system 2800, whereinthe fluid controller system has moved in a direction of arrow 3002,relative to housing portion 2802, to align first fluid chamber outlet2860 with a fluid path 3004 to assay chamber 2826. This is referred toherein as a first functionally open position. Fluid path 3004 includessample chamber inlet 2822, sample chamber 2816, sample chamber outlet2824, transient fluid chamber 2836, and assay chamber inlet 2828.

As continued force is applied to fluid controller 2808, fluidcontrollers 2804, 2806, and 2808 continue to move in the direction ofarrow 3002, to expel fluid from first fluid chamber 2810 to assaychamber 2826, through fluid path 2804. The fluid may flow over orthrough assay substrate 2830, to waste fluid chamber 2834.

FIG. 31 is a cross-sectional block diagram of assay system 2800, whereinthe fluid controller system has moved further in the direction of arrow3002, to align second fluid chamber outlet 2848 with a fluid path 3104to assay chamber 2826. This is referred to herein as a secondfunctionally open position. Fluid path 3104 includes fluid channel 2858to bypass O-ring 2840 and first fluid controller 2804, first fluidchamber outlet 2860, transient fluid chamber 2836, fluid channel 2838 tobypass O-ring 2842, and assay chamber inlet 2828.

As continued force is applied to fluid controller 2808, fluidcontrollers 2806 and 2808 continue to move in the direction of arrow3002, to expel fluid from second fluid chamber 2812 to assay chamber2826, through fluid path 3104. The fluid may flow over or through assaysubstrate 2830, to waste fluid chamber 2834.

FIG. 32 is a cross-sectional block diagram of assay system 2800, whereinthe fluid controller system has moved further in the direction of arrow3002, to align third fluid chamber outlet 2848 with a fluid path 3204 toassay chamber 2826. This is referred to herein as a third functionallyopen position. Fluid path 3204 includes fluid channel 2862 to bypassO-ring 2846 and second flow controller 2806, fluid channel 2858, firstfluid chamber outlet 2860, transient fluid chamber 2836, and assaychamber inlet 2828.

As continued force is applied to fluid controller 2808, fluid controller2808 continues to move in the direction of arrow 3002, to expel fluidfrom third fluid chamber 2814 to assay chamber 2826, through fluid path3204. The fluid may flow over or through assay substrate 2830, to wastefluid chamber 2834.

FIG. 33 is a cross-sectional block diagram of assay system 2800, whereinthe fluid controller system has expelled fluid from third fluid chamber2814.

Assay system 2800 may include an actuator system, which may beconfigured to act upon third fluid controller 2808.

One or more inlets, outlets, channels, and fluid pathways as describedherein with respect to assay system 2200 and assay system 2800 may beimplemented as one or more of gates and passageways as described in oneor more preceding examples, an may include one or more of:

-   -   a fluid channel within an inner surface of a housing;    -   a fluid passage within a housing, having a plurality of openings        through an inner surface of the housing;    -   the fluid passage through a fluid controller; and    -   a fluid channel formed within an outer surface of one of the        fluid controllers.

One or more inlets, outlets, channels, fluid paths, gates, andpassageways, as described herein, may include one or more flowrestrictors, such as check valves, which may include a frangible checkvalve, to inhibit fluid flow when a pressure difference across the flowrestrictor valve is below a threshold.

VII. Example Actuator Systems

A user-initiated actuator system may include one or more of a mechanicalactuator, an electrical actuator, an electro-mechanical actuator, and achemical reaction initiated actuator. Example user-initiated actuatorsystems are disclosed below, one or more of which may be implementedwith example pumps disclosed above.

FIG. 34 is cross-sectional view of a mechanical actuator system 3400.Actuator system 3400 includes a button 3402 slideably disposed throughan opening 3404 of an outer housing portion 3406, and through an opening3408 of a frangible inner wall 3410 of outer housing portion 3406.Button 3402 includes a detent 3412 that extends beyond openings 3404 and3408 to secure button 3402 between housing portion 3406 and frangibleinner wall 3410.

Actuator system 3400 includes a compressible spring 3414 having a firstend positioned within a cavity 3416 of button 3402, and a second enddisposed within a cavity 3418 of a member 3420. Member 3420 may becoupled to, or may be a part of a fluid controller system, such a partof a plunger or fluid controller as described and illustrated in one ormore examples herein.

Actuator system 3400 includes an inner housing portion 3422, slideablyengaged within outer housing portion 3406. Inner housing portion 3422includes one or more detents, illustrated here as detents 3424 and 3426,to lockingly engage one or more corresponding openings 3428 and 3430 inan inner surface of outer housing portion 3402, as described below withrespect to FIG. 35.

Actuator system 3400 includes one or more frangible snaps 3432 coupled,directly or indirectly, to inner housing portion 3422. Frangible snap3432 includes a locking detent 3434, and member 3420 includes acorresponding locking detent 3436 to releasably couple member 3420 tofrangible snap 3432.

Operation of actuator system 3400 is described below with respect toFIGS. 35 and 36.

FIG. 35 is cross-sectional view of actuator system 3400, wherein innerhousing detents 3424 and 3426 are lockingly engaged with outer housingopenings 3428 and 3430. This configuration may be achieved by sliding orcompressing inner housing portion 3422 and outer portion 3406 towardsone another. In the configuration of FIG. 35, spring 3414 is in acompressed position, and has potential energy to cause a fluidcontroller system associated with member 3420 to move as described inexamples above. In this configuration, button 3402 is proximate tofrangible snap 3432, while frangible snap detent 3434 and member lockingdetent 3436 remain engaged with one another to preclude member 3420 frommoving in response to the potential energy of compressed spring 3414.Inner housing detents 3424 and 3426 remain lockingly engaged with outerhousing openings 3428 and 3430 to preclude inner housing portion 3422and outer housing portion 3406 from moving apart from one another inresponse to the potential energy of compressed spring 3414.

FIG. 36 is cross-sectional view of actuator system 3400, wherein button3402 is pressed with sufficient force to move detent 3412 past frangiblewall 3408, and to cause button 3402 to spread frangible snap 3432. Uponspreading of frangible snap 3432, frangible snap detent 3434 and memberlocking detent 3436 disengage from one another, to allow the potentialforce of compressed spring 3424 to act on member 3420.

Actuator system 3400 may be implemented within assay system 300 in FIG.3, as described below with respect to FIGS. 37 and 38.

FIG. 37 is a perspective view of an assay system 3700, including anouter housing portion 3702 and an inner housing portion 3704,illustrated here in a first position relative to one another. Outerhousing portion 3702 may correspond to outer housing portion 3406 (FIGS.34-36), and inner housing portion 3704 may correspond to inner housingportion 3422. Assay system 3700 further includes an actuator button 3712and an opening 3714, which may correspond to button 3402 and opening3428, respectively, in FIGS. 34-36.

FIG. 38 is another perspective view of assay system 3700, wherein outerhousing portion 3702 and inner housing portion 3704 are illustrated in asecond position relative to one another, which may correspond to FIG. 35or 36.

Assay system 3700 further includes a sample chamber 3706, a samplechamber lid hingedly connected to inner housing portion 3704 to encloseand seal sample chamber 3706, and a display window 3710.

Assay system 3700 may include assay system 2200 (FIGS. 22-27), whereininner housing portion 3704 correlates to housing portion 2202, samplechamber 3706 correlates to sample chamber 2216, and display window 3710correlates to display window 2232.

Similarly, assay system 3700 may include assay system 2800 (FIGS.28-33), wherein inner housing portion 3704 correlates to housing portion2802, sample chamber 3706 correlates to sample chamber 2816, and displaywindow 3710 correlates to display window 2832.

Similarly, assay system 3700 may include one or more pumps 600, 900,1100, 1500, 1800, 2100.

A user-initiated actuator may be configured to individually controlmultiple sets of one or more plungers or fluid controllers. FIG. 39 is across-sectional diagram of a portion of an assay system 3900, includinga plurality of control rods, or stems 3910 a-3910 c, to individuallycontrol, through pushing and/or pulling, a plurality of sets of one ormore plungers or fluid controllers, in response to corresponding forcesfrom a user-initiated actuator.

One or more stems 3910 may be coupled to a plurality of adjacent and/ornon-adjacent plungers. Stems 3910 may be individually controllable toexert a force, push and/or pull, on respective plungers.

One or more of stems 3910 may be telescoped inside another one of stems3910, as illustrated in FIG. 40. One or more of stems 3910 may beimplemented as individual stems 3910, as illustrated in FIG. 41.

FIG. 21 is a cross-sectional block diagram of a portion of an assaysystem 2100, including a user-initiated actuator 2104, and one or morefluid passages 2110 within a housing 2102, between user-initiatedactuator 2104 and one or more fluid chambers. User-initiated actuator2104 may include a combination of chemicals, separated by auser-rupturable membrane, within a flexible tear-resistant membrane2106, which, when combined, create a pressurized fluid, as is wellknown. The pressurized fluid may be gas or liquid. The pressurized fluidcauses fluid controllers 2112 to move as described in one or moreexamples above. Multiple user-rupturable membranes may be implementedfor multiple fluid passages 2110.

What is claimed is:
 1. A method of preparing an assay, comprising:immobilizing a binding pair molecule on an assay substrate of aportable, user-initiated fluidic assay system, wherein the assay systemincludes, a portable housing having a sample portion, an assay portion,a sample fluid passage between a fluid outlet of the sample portion anda fluid inlet of the assay portion, and a plurality of fluid chambers,each of the plurality of fluid chambers having a fluid chamber outlet, afluid controller system separating the plurality of fluid chambers andmovably disposed within the housing to align each of the plurality offluid chamber outlets a with corresponding fluid path to one or more ofanother one of the fluid chambers, the sample portion, and the assayportion, and a user-initiated mechanical actuator coupled to the fluidcontroller system; providing a dilutent solution to a first fluidchamber of the assay system; providing a labeled secondary binding pairmolecule solution to a second fluid chamber of the assay system; andproviding a wash solution to a third fluid chamber of the assay system.2. A method of assaying, comprising: receiving a sample within aportable, point-of-care, user-initiated fluidic assay system, whereinthe assay system includes, a portable housing having a sample portion,an assay portion, a sample fluid passage between a fluid outlet of thesample portion and a fluid inlet of the assay portion, and a pluralityof fluid chambers, each of the plurality of fluid chambers having afluid chamber outlet, a fluid controller system separating the pluralityof fluid chambers and movably disposed within the housing to align eachof the plurality of fluid chamber outlets a with corresponding fluidpath to one or more of another one of the fluid chambers, the sampleportion, and the assay portion, and a user-initiated mechanical actuatorcoupled to the fluid controller system; fluidizing the sample, undercontrol of the user-initiated mechanical actuator; contacting a bindingpair molecule with the fluidized sample, under control of theuser-initiated mechanical actuator; contacting the binding pair moleculewith a labeled secondary binding pair molecule solution, under controlof the user-initiated mechanical actuator; washing an assay substratewithin the assay system, under control of the user-initiated mechanicalactuator; and displaying a result of the contactings.